File-Based C# Apps When to Use - Testing a C# concept, API, or language feature with a quick file-based app - Prototyping logic before integrating it into a larger project - Building a small utility from one entry-point file and a few helper files When Not to Use - The user asks for a language-agnostic quick script, throwaway computation, or shell/Python/PowerShell-style automation - The user needs a full project, solution integration, or project references in an existing app - The user is working inside an existing .NET solution and wants to add code there - The app is large enough that proj…